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170=5(4-5k)
We move all terms to the left:
170-(5(4-5k))=0
We add all the numbers together, and all the variables
-(5(-5k+4))+170=0
We calculate terms in parentheses: -(5(-5k+4)), so:We get rid of parentheses
5(-5k+4)
We multiply parentheses
-25k+20
Back to the equation:
-(-25k+20)
25k-20+170=0
We add all the numbers together, and all the variables
25k+150=0
We move all terms containing k to the left, all other terms to the right
25k=-150
k=-150/25
k=-6
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